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ACQUISITION OF MGE Part 4 - Pro Forma Information (Details) (Missouri Gas Energy (MGE) [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012
Missouri Gas Energy (MGE) [Member] |  |
Business Acquisition, Pro Forma Information [Abstract] |  |
Total net revenues | $ 1,518,201 | $ 1,581,425
Net Income | $ 83,642 | $ 81,722
Earnings per share: |  |
Basic (in dollars per share) | $ 2.57 | $ 2.52
Diluted (in dollars per share) | $ 2.56 | $ 2.51

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